st2064b Sitronix Technology Corporation, st2064b Datasheet - Page 27

• Manufacturer Part Number: st2064b
• Description: 8 Bit Microcontroller With 64k Bytes Rom
• Manufacturer: Sitronix Technology Corporation

13.2 Tone Generator
13.2.1 General Description
The tone frequency is decided by PSGCK and 12-bit
programmable divider (PSG[11~0]). Please refer to
Ver. 3.0
Frequency of Channel 0 Tone = PSGCK/(1000H-PCH0[11~0])/2
Frequency of Channel 1 Tone = PSGCK/(1000H-PCH1[11~0])/2
PSG0[11~8]
PSG1[11~8]
PSG0[7~0]
PSG1[7~0]
PSGCK
PSGCK
C0EN
C1EN
LOAD
LOAD
FIGURE 13-3 Tone Generator Channel 0
FIGURE 13-4 Tone Generator Channel 1
C0[11~8]
C1[11~8]
C0[7~0]
CLOCK
C1[7~0]
CLOCK
Enable
Enable
Latch
Latch
12 Bit Auto-reload Up Counter
12 Bit Auto-reload Up Counter
Channel 0
Channel 1
27/57
FIGURE 13-3 and. FIGURE 13-4.
OUTPUT
OUTPUT
Tone out
Tone out
ST2064B
5/8/09